ALEXANDRIA, Va., June 18 -- United States Patent no. 12,327,698, issued on June 10, was assigned to Primax Electronics Ltd. (Taipei, Taiwan).
"Keyboard device" was invented by Chou-Liang Liu (Taipei, Taiwan), Chen-Wei Chan (Taipei, Taiwan) and Tsung-Wen Hsueh (Taipei, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A keyboard device includes a membrane circuit board and a support plate. The membrane circuit board has a plurality of key regions and a peripheral region surrounding the key regions. The membrane circuit board includes: a lower membrane layer; an upper membrane layer disposed over the lower membrane layer; and a sensing circuit pattern disposed over the upper membrane layer and in the perip...